RAD 100 - CT Homework: Radiography and CT Scanner Components

The process related to the first computed tomography scanner was called ________

computerized transverse axial scanning

tomography is a method of imaging various planes in the body. motion is used to _________ certain portions of the patient's anatomy in order to see a particular ________ better

blur, location

modern CT scanners can only image the body in the axial plane

false

modern CT scanners can measure the amount of calcium in the coronary arteries

true

which of the following sources of radiation were used in Hounsfield's first primitive CT scanner?

Americium

first generation scanners were only capable of imaging the:

head/brain

what Houndfield Unit is assigned to water?

0

modern CT scanners use a/an _________ to produce the radiation needed to image the patient

x ray tube

modern CT scanners allow the entire data acquisition and reconstruction process to be completed in typically less than ________ seconds

20

unlike conventional CT scanning, in Volume Scanning the x ray tube traces a/an _______ path with a radius equal to the distance from the focal spot to the center of rotation

spiral/helical

with spiral or helical scanning, an entire ________ of data is acquired without the x ray tube stopping for the patient to ________ to the next position

volume, move

image creation in CT is very dependent on _________ of the x ray beam in tissue measured as that beam rotates

attenuation

despite the fact that slice-by-slice CT scanning is theoretically more accurate, it has the following limitations (select all that apply):

longer exam times because of interscan delay

omitted anatomy due to inconsistent patient respiration to as slice-to-slice misregistration

inaccurate generation of 3D or reformatted imaged producing stair-step artifacts

few slices with maximum contrast enhancement

_________ is a digital image processing technique used in CT to modify imaged through a filter function

convolution

images created by a CT scanner are in an analog format

false

CT is a post-primary registry

true

unlike MRI, CT scanning does not use ionizing radiation to produce images

false

to be eligible to take the registry exam in CT, a candidate must earn a competency in a minimum of ________ procedures

125

michigan is not a licensure state for radiography, but it is a licensure state for CT

true

name the components of the CT scanner